recently had an opportunity to purchase one of these tanks off of craigslist, jumped at it. Now when i purcahsed the head i assumed the overdrive would be up to snuff with Death From Above 1979's Jesse Keeler's sound. It is not, and is much weaker than i had anticipated. He does not use any pedals and all the overdrive he gets is from his F-800B and acoustic head. Now i was recently chatting with him and it ends up that the VERY earliest peavey heads WITHOUT footswitches had a different overdrive circuit than the ones with the footswitch. I want to know if anyone out there happens to know where i can locate the early non-footswitch model schematics? my tech and i want to attempt to change the current setup to early specs so that the overdrive sounds as it should. thanks for the help!